#include<stdio.h>

int global = 20;

const float PI = 3.14;


void f();

int main() {
    f();
    printf("global variable : %d\n", global);
    printf("PI : %f\n", PI);
    return 0;
}

void f() {
    global += 1;
    printf("function : %d\n", global);
}